On September 11, 1777, American troops clashed with the British in the Battle of Brandywine in Pennsylvania, resulting in an American defeatthat allowed the British to easily capture Philadelphia later that month.
In early September, with British General William Howe’s troops advancing toward Philadelphia, George Washington deployed his army along the east side of Brandywine Creek, about 25 miles from Philadelphia, and took up a defensive position to meet the British.
Washington was expecting the British to launch a frontal attack, and at first, that’s what appeared to be happening, as British troops congregated on the other side of the creek opposite Washington’s Center.
However, Washington received intelligence that a large force of the British army was heading north to cross the creek higher up and outflank the Americans. So Washington sent out orders to reposition his troops to meet the threat. But before the orders could be fully carried out, Washington received conflicting news that there were no British to the north, and he rescinded his orders. Full Article
Professor Ed Lengel discusses General George Washington's strategic plans, actions, and challenges at the Battle of Brandywine, fought on September 11, 1777. mountvernon.org